US5239106A - Method of recovering and purifying diphenylcarbonate from phenolic solutions thereof - Google Patents
Method of recovering and purifying diphenylcarbonate from phenolic solutions thereof Download PDFInfo
- Publication number
- US5239106A US5239106A US07/929,860 US92986092A US5239106A US 5239106 A US5239106 A US 5239106A US 92986092 A US92986092 A US 92986092A US 5239106 A US5239106 A US 5239106A
- Authority
- US
- United States
- Prior art keywords
- phenol
- diphenylcarbonate
- adduct
- crystalline
- mixture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C68/00—Preparation of esters of carbonic or haloformic acids
- C07C68/08—Purification; Separation; Stabilisation
Definitions
- the present invention relates to a method for recovering diphenylcarbonate in substantially pure form from a solution of diphenylcarbonate and phenol. More particularly, the present invention relates to the formation of a crystalline 1:1 molar adduct of diphenylcarbonate and phenol in a solution of diphenylcarbonate and phenol, the isolation of such 1:1 molar adduct from such phenolic solution, and the recovery of diphenylcarbonate therefrom.
- diphenylcarbonate was made by a variety of procedures which resulted in the production of mixtures of diphenylcarbonate and phenol.
- One procedure involves the phosgenation of phenol in an aqueous environment (slurry or melt), or in a solvent such as methylene chloride. After the removal of sodium chloride, the diphenylcarbonate can be separated from residual phenol by vacuum distillation.
- a second route to diphenylcarbonate is by transesterification of dimethylcarbonate with phenol.
- a more direct procedure for making diphenylcarbonate involves the carbonylation of phenol with carbon monoxide.
- a transition metal catalyst such as a palladium catalyst is used in the carbonylation route in combination with a quaternary ammonium halide.
- a further procedure for making diphenylcarbonate involves the reaction between a cycloalkylene carbonate and phenol.
- the carbonylation of phenol can involve the use of a complex palladium catalyst which can include a thermally unstable quaternary ammonium halide which can generate corrosive by-products.
- Reaction by-products such as phenyl salicylate and organic cocatalyst, such as benzoquinone, which can be consumed during the course of the reaction can result in additional impurities in the carbonylation reaction mixture.
- separation of unreacted phenol can be effected by distillation from the reaction mixture, the diphenylcarbonate residue can be contaminated with various catalyst ingredients.
- the present invention is based on the discovery that a single phase mixture ranging from about 20-70% by weight of diphenylcarbonate and about 80-30% by weight of phenol can form a crystalline 1:1 molar diphenylcarbonate-phenol adduct, if allowed to cool to a temperature below 51° C.
- the 1:1 molar crystalline adduct can be separated from the remaining liquid phase. Heating the recovered 1:1 molar crystalline adduct to a temperature of 40°-180° C. at a reduced pressure can provide the separation of phenol by distillation and a substantially pure diphenylcarbonate residue.
- a diphenylcarbonate purification method which comprises,
- adduct crystalline 1:1 molar adduct of diphenylcarbonate and phenol, hereinafter referred to as "adduct"
- a solution of diphenylcarbonate and phenol at temperatures in the range of between about 33° C. to 48° C.
- Such phenol and diphenylcarbonate (DPC) solutions can have an initial DPC content of about 30-60% by weight and can provide an adduct recovery of up to about 70% by weight, or up to 80% by weight of DPC.
- a second crystallization of the adduct from the remaining mother liquor at 37° C. can provide an additional 28% by weight of DPC at an adduct solids level of about 29% by weight.
- the total recovery of DPC from the recovered adduct utilizing standard distillation procedures at temperatures of up to 180° C., and preferably 60° to 120° C., at pressures of 10 torr to 150 torr can therefore be up to 70% by weight of DPC.
- Impurities in the initial phenol DPC mixture can vary depending upon the type of reaction used to form the DPC.
- a solution of phenol and DPC formed during a carbonylation reaction can have such impurities as tetrabutylammonium bromide (TBAB), phenyl salicylate, and a number of side products such as, isomeric biphenols, phenolic ethers and subsequent products resulting from the carbonylation of these compounds.
- TBAB tetrabutylammonium bromide
- phenyl salicylate phenyl salicylate
- side products such as, isomeric biphenols, phenolic ethers and subsequent products resulting from the carbonylation of these compounds.
- a convenient measuring procedure for the degree of contamination is the "rejection factor" which is defined as the mass of the contaminant in the liquid phase divided by the mass of the contaminant in the adduct phase. Accordingly, a minimum acceptable rejection factor might be 4:1, while a mixture having substantially pure adduct or a minimal amount of contamination in the adduct phase would have a substantially higher rejection factor, such as up to 100:1. Contamination of adduct crystals also can be effected with adduct liquid.
- aqueous phenol such as a mixture of 9% water and 91% phenol (liquified phenol) can minimize the loss of DPC by washing the adduct.
- the following example shows the procedure for making diphenyl carbonate utilizing a gas flow reactor.
- the gas flow reactor is capable of delivering in a continuous manner, a mixture of carbon monoxide and oxygen maintained at a substantially constant molar ratio and partial pressure.
- the diphenyl carbonate was prepared by a carbonylation reaction using a palladium catalyst, tetrabutylammonium bromide, a cobalt complex containing a pentadentate Schiff base ligand, and terpyridine. The following procedure was employed:
- the reactor was heated to 110° C. over a 15 minute period Stirring was initiated at 540-550 rpm once the reactor temperature reached 40° C. Upon reaching a reactor temperature of 110° C., aliquots were taken periodically for GC analysis in order to quantify the amount of diphenyl carbonate produced. At 0.5 hr, the yield of diphenyl carbonate was 9.79 g (14.26%). At 1.0 hr, the yield of diphenyl carbonate was 16.2 g (23.6%). At 2.0 hr, the yield of diphenyl carbonate was 23.1 g (33.7%). After the two hour sample was taken, the reaction mixture was cooled at 60° C., and depressurized to atmospheric pressure.
- the combined reaction mixtures were then allowed to cool to 40° C. which resulted in the separation of a DPC/phenol adduct.
- the DPC/phenol adduct was recovered from the reaction mixture by vacuum filtration resulting in the recovery of 58.5 g of the adduct representing a 74% yield.
- the DPC/phenol adduct was then heated to a temperature of 120° C. at a pressure of 80 torr to effect the distillation of phenol which resulted in the recovery of about 33.4 g of diphenyl carbonate.
- a mixture of 50 grams of phenol and 50 grams of diphenylcarbonate at 80° C. was cooled to 45° C., then maintained at 45° C. for 1 hour.
- a mixture having about 30% solids was produced.
- a diphenylcarbonate/phenol adduct was recovered by filtration. There was obtained, 30.2 grams of adduct which provided 21 grams of diphenylcarbonate upon phenol distillation.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/929,860 US5239106A (en) | 1992-08-17 | 1992-08-17 | Method of recovering and purifying diphenylcarbonate from phenolic solutions thereof |
EP93306331A EP0583936B1 (de) | 1992-08-17 | 1993-08-11 | Gewinnung und Reinigung von Diphénylcarbonat |
DE69315011T DE69315011T2 (de) | 1992-08-17 | 1993-08-11 | Gewinnung und Reinigung von Diphenylcarbonat |
ES93306331T ES2108826T3 (es) | 1992-08-17 | 1993-08-11 | Recuperacion y purificacion de carbonato de difenilo. |
JP5203055A JP2752570B2 (ja) | 1992-08-17 | 1993-08-17 | ジフェニルカーボネートをそのフェノール溶液から回収し精製する方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/929,860 US5239106A (en) | 1992-08-17 | 1992-08-17 | Method of recovering and purifying diphenylcarbonate from phenolic solutions thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
US5239106A true US5239106A (en) | 1993-08-24 |
Family
ID=25458575
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/929,860 Expired - Lifetime US5239106A (en) | 1992-08-17 | 1992-08-17 | Method of recovering and purifying diphenylcarbonate from phenolic solutions thereof |
Country Status (5)
Country | Link |
---|---|
US (1) | US5239106A (de) |
EP (1) | EP0583936B1 (de) |
JP (1) | JP2752570B2 (de) |
DE (1) | DE69315011T2 (de) |
ES (1) | ES2108826T3 (de) |
Cited By (44)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0687666A1 (de) | 1994-06-15 | 1995-12-20 | Bayer Ag | Verfahren zur Reinigung von Diphenylcarbonat |
EP0776882A1 (de) | 1995-11-28 | 1997-06-04 | Ube Industries, Ltd. | Diphenyloxalat-Phenolcomplex, Verfahren zur Herstellung der Complexverbindung und Verfahren zum Herstellen von Diphenyloxalat aus dieser Komplexverbindung |
EP0801053A1 (de) * | 1996-04-09 | 1997-10-15 | Bayer Ag | Rückgewinnung von Katalysatorsystemen aus diarylcarbonathaltigen Reaktionslösungen durch Suspensionskristallisation |
EP0801052A1 (de) * | 1996-04-09 | 1997-10-15 | Bayer Ag | Rückgewinnung von Katalysatorsystemen aus diarylcarbonathaltigen Reaktionsgemischen durch Schmelzkristallisation |
US5756801A (en) * | 1997-02-10 | 1998-05-26 | General Electric Company | Method of purifying diphenyl carbonate-phenol adduct |
US5856554A (en) * | 1996-05-17 | 1999-01-05 | Bayer Ag | Process for producing diaryl carbonates |
US6114564A (en) * | 1999-08-27 | 2000-09-05 | General Electric Company | Catalyst composition and method for producing diaryl carbonates |
US6114563A (en) * | 1999-04-29 | 2000-09-05 | General Electric Co. | Method and catalyst system for producing aromatic carbonates |
US6143914A (en) * | 1999-04-29 | 2000-11-07 | General Electric Company | Method and catalyst system for producing aromatic carbonates |
US6143913A (en) * | 1999-04-29 | 2000-11-07 | General Electric Company | Method and catalyst system for producing aromatic carbonates |
US6160154A (en) * | 1999-04-29 | 2000-12-12 | General Electric Company | Method and catalyst system for producing aromatic carbonates |
US6160155A (en) * | 1999-04-29 | 2000-12-12 | General Electric Company | Method and catalyst system for producing aromatic carbonates |
US6175033B1 (en) | 2000-02-22 | 2001-01-16 | General Electric Company | Method and catalyst system for producing aromatic carbonates |
US6175032B1 (en) | 2000-02-22 | 2001-01-16 | General Electric Company | Method and catalyst system for producing aromatic carbonates |
US6180812B1 (en) | 1999-08-27 | 2001-01-30 | General Electric Company | Catalyst composition and method for producing diaryl carbonates using amide as promoter |
US6184409B1 (en) | 2000-03-01 | 2001-02-06 | General Electric Company | Method and catalyst system for producing aromatic carbonates |
US6187942B1 (en) | 2000-03-01 | 2001-02-13 | General Electric Company | Method and catalyst system for producing aromatic carbonates |
US6197991B1 (en) | 1999-04-29 | 2001-03-06 | General Electric Company | Method and catalyst system for producing |
US6201146B1 (en) | 1999-04-29 | 2001-03-13 | General Electric Company | Method and catalyst system for producing aromatic carbonates |
US6207849B1 (en) | 2000-01-31 | 2001-03-27 | General Electric Company | Method and catalyst system for producing aromatic carbonates |
US6215014B1 (en) | 1999-08-27 | 2001-04-10 | General Electric Company | Catalyst composition and method for producing diaryl carbonates |
US6310232B1 (en) | 2000-11-10 | 2001-10-30 | General Electric Company | Method for recycle of bromide-containing catalyst constituents |
US6365538B1 (en) | 2000-01-31 | 2002-04-02 | General Electric Company | Method and catalyst system for producing aromatic carbonates |
US6384262B1 (en) | 2000-12-14 | 2002-05-07 | General Electric Company | Process for the production of diaryl carbonates |
US6410774B1 (en) | 2001-03-30 | 2002-06-25 | General Electric Company | Method for recovery of catalyst components |
US6420589B1 (en) | 2000-12-14 | 2002-07-16 | General Electric Company | Process for the production of diaryl carbonates |
US6437166B1 (en) | 1998-12-22 | 2002-08-20 | Bayer Aktiengesellschaft | Method for reprocessing reaction mixtures containing diaryl carbonate |
US6440893B1 (en) | 2001-03-30 | 2002-08-27 | General Electric Company | Method and catalyst composition for producing aromatic carbonates |
US6441215B1 (en) | 2001-06-06 | 2002-08-27 | General Electric Company | Method for reducing carbonate decomposition in reaction mixtures |
US6440892B1 (en) | 2001-03-30 | 2002-08-27 | General Electric Company | Method and catalyst composition for producing aromatic carbonates |
US6462217B1 (en) | 2000-10-30 | 2002-10-08 | General Electric Company | Oxidative carbonylation of hydroxyaromatic compounds |
US6465675B1 (en) | 2000-10-02 | 2002-10-15 | General Electric Company | Method and catalyst system for producing aromatic carbonates |
US6472498B2 (en) | 2000-08-04 | 2002-10-29 | Ube Industries, Ltd. | Diaryl carbonate product and production of polycarbonate |
US20020177724A1 (en) * | 2001-03-30 | 2002-11-28 | General Electric Company | Method for producing aromatic carbonates |
US6506924B2 (en) | 2001-03-30 | 2003-01-14 | General Electric Company | Method for recovery of catalyst components |
US6512134B2 (en) | 2000-11-30 | 2003-01-28 | General Electric Company | Method and catalyst system for producing aromatic carbonates |
US6521777B2 (en) | 2000-12-14 | 2003-02-18 | General Electric Company | Process for the production of diaryl carbonates |
US20030109738A1 (en) * | 2001-08-27 | 2003-06-12 | Claus-Peter Reisinger | Separation of impurities and/or valuable substances from solutions containing diaryl carbonate by solution crystallization |
US20030162989A1 (en) * | 2000-04-07 | 2003-08-28 | Ohashi Kenji E | Method of separating and recovering aromatic carbonate and production process |
US20030162652A1 (en) * | 2002-02-25 | 2003-08-28 | General Electric Crd | Method and catalyst composition for producing aromatic carbonates using activating solvents |
US20080053836A1 (en) * | 2006-09-02 | 2008-03-06 | Bayer Material Science Ag | Process for the production of diaryl carbonates and treatment of alkalichloride solutions resulting therefrom |
WO2015169775A1 (de) | 2014-05-09 | 2015-11-12 | Covestro Deutschland Ag | Verfahren zur herstellung von diarylcarbonaten |
CN109336764A (zh) * | 2018-11-28 | 2019-02-15 | 四川久润环保科技有限公司 | 一种乙醇、碳酸二苯酯、二丁酯混合物的分离方法及系统 |
CN113577814A (zh) * | 2021-08-16 | 2021-11-02 | 四川中蓝国塑新材料科技有限公司 | 一种用于聚碳酸酯工业化生产的碳酸二苯酯回收装置及方法 |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4866474A (en) * | 1987-01-23 | 1989-09-12 | Minolta Camera Kabushiki Kaisha | Copying apparatus capable of forming a composite image of an outline image and a normal image |
US4862216A (en) * | 1987-01-28 | 1989-08-29 | Minolta Camera Kabushiki Kaisha | Multicolor copying apparatus |
JPS63208871A (ja) * | 1987-02-26 | 1988-08-30 | Minolta Camera Co Ltd | 作像装置 |
JPS6420575A (en) * | 1987-07-15 | 1989-01-24 | Minolta Camera Kk | Multicolor copying machine |
EP0592900A3 (de) * | 1992-10-14 | 1995-02-22 | Daicel Chem | Verfahren zur Darstellung von Polycarbonaten durch Polykondensation in der Schmelze. |
DE69425130T2 (de) * | 1994-04-14 | 2000-11-09 | Daicel Chemical Industries, Ltd. | Verfahren zur Herstellung von (Co)Polycarbonaten |
US20030028043A1 (en) * | 1995-08-01 | 2003-02-06 | Gaylord M. Kissinger | Process for purifying diaryl carbonates |
DE19605167A1 (de) * | 1996-02-13 | 1997-08-14 | Bayer Ag | Verfahren zur extraktiven Abtrennung von Diarylcarbonaten und den zugrundeliegenden aromatischen Hydroxyverbindungen aus Reaktionslösungen |
Citations (4)
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US3251873A (en) * | 1962-07-03 | 1966-05-17 | Union Carbide Corp | Process for preparing diaryl carbonates |
GB1096936A (en) * | 1965-02-25 | 1967-12-29 | Bayer Ag | Process for the purification of diaryl carbonates |
US4013702A (en) * | 1974-12-11 | 1977-03-22 | Societe Nationale Des Poudres Et Explosifs | Process for the purification of polycarbonates |
JPH03200746A (ja) * | 1989-12-28 | 1991-09-02 | Asahi Chem Ind Co Ltd | ジアリールカーボネートの製造方法 |
-
1992
- 1992-08-17 US US07/929,860 patent/US5239106A/en not_active Expired - Lifetime
-
1993
- 1993-08-11 ES ES93306331T patent/ES2108826T3/es not_active Expired - Lifetime
- 1993-08-11 EP EP93306331A patent/EP0583936B1/de not_active Expired - Lifetime
- 1993-08-11 DE DE69315011T patent/DE69315011T2/de not_active Expired - Lifetime
- 1993-08-17 JP JP5203055A patent/JP2752570B2/ja not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US3251873A (en) * | 1962-07-03 | 1966-05-17 | Union Carbide Corp | Process for preparing diaryl carbonates |
GB1096936A (en) * | 1965-02-25 | 1967-12-29 | Bayer Ag | Process for the purification of diaryl carbonates |
US4013702A (en) * | 1974-12-11 | 1977-03-22 | Societe Nationale Des Poudres Et Explosifs | Process for the purification of polycarbonates |
JPH03200746A (ja) * | 1989-12-28 | 1991-09-02 | Asahi Chem Ind Co Ltd | ジアリールカーボネートの製造方法 |
Cited By (77)
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---|---|---|---|---|
US5495038A (en) * | 1994-06-15 | 1996-02-27 | Bayer Aktiengesellschaft | Process for the purification of diphenyl carbonate |
EP0687666A1 (de) | 1994-06-15 | 1995-12-20 | Bayer Ag | Verfahren zur Reinigung von Diphenylcarbonat |
EP0776882A1 (de) | 1995-11-28 | 1997-06-04 | Ube Industries, Ltd. | Diphenyloxalat-Phenolcomplex, Verfahren zur Herstellung der Complexverbindung und Verfahren zum Herstellen von Diphenyloxalat aus dieser Komplexverbindung |
US5705677A (en) * | 1995-11-28 | 1998-01-06 | Ube Industries, Ltd. | Diphenyl oxalate-phenol adduct, process for producing the adduct and method of producing diphenyl oxalate from the adduct |
US5965472A (en) * | 1996-04-09 | 1999-10-12 | Bayer Ag | Recovery of catalyst systems from diaryl carbonate-containing reaction solutions by suspension crystallization |
EP0801053A1 (de) * | 1996-04-09 | 1997-10-15 | Bayer Ag | Rückgewinnung von Katalysatorsystemen aus diarylcarbonathaltigen Reaktionslösungen durch Suspensionskristallisation |
EP0801052A1 (de) * | 1996-04-09 | 1997-10-15 | Bayer Ag | Rückgewinnung von Katalysatorsystemen aus diarylcarbonathaltigen Reaktionsgemischen durch Schmelzkristallisation |
CN1078883C (zh) * | 1996-04-09 | 2002-02-06 | 拜尔公司 | 通过熔体结晶从含碳酸二芳基酯的反应混合物中回收催化剂体系的方法 |
US5824816A (en) * | 1996-04-09 | 1998-10-20 | Bayer Ag | Recovery of catalyst systems from diarylcarbonate-containing reaction mixtures by melt crystallization |
CN1078884C (zh) * | 1996-04-09 | 2002-02-06 | 拜尔公司 | 通过悬浮体结晶从含碳酸二芳基酯的反应混合物中回收催化剂体系的方法 |
US5856554A (en) * | 1996-05-17 | 1999-01-05 | Bayer Ag | Process for producing diaryl carbonates |
EP0857716A1 (de) * | 1997-02-10 | 1998-08-12 | General Electric Company | Methode zum Reinigen eines Diphenylcarbonat-Phenolkomplexes |
US5756801A (en) * | 1997-02-10 | 1998-05-26 | General Electric Company | Method of purifying diphenyl carbonate-phenol adduct |
US6437166B1 (en) | 1998-12-22 | 2002-08-20 | Bayer Aktiengesellschaft | Method for reprocessing reaction mixtures containing diaryl carbonate |
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US6114563A (en) * | 1999-04-29 | 2000-09-05 | General Electric Co. | Method and catalyst system for producing aromatic carbonates |
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US6215014B1 (en) | 1999-08-27 | 2001-04-10 | General Electric Company | Catalyst composition and method for producing diaryl carbonates |
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US6346500B1 (en) | 1999-08-27 | 2002-02-12 | General Electric Company | Catalyst system for producing aromatic carbonates |
US6346499B1 (en) | 1999-08-27 | 2002-02-12 | General Electric Company | Catalyst composition for producing diaryl carbonates using carboxylic acid amide as promoter |
US6180812B1 (en) | 1999-08-27 | 2001-01-30 | General Electric Company | Catalyst composition and method for producing diaryl carbonates using amide as promoter |
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US20030162989A1 (en) * | 2000-04-07 | 2003-08-28 | Ohashi Kenji E | Method of separating and recovering aromatic carbonate and production process |
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US6706908B2 (en) | 2001-03-30 | 2004-03-16 | General Electric Company | Method and catalyst composition for producing aromatic carbonates |
US6700008B2 (en) | 2001-03-30 | 2004-03-02 | General Electric Company | Method and catalyst composition for producing aromatic carbonates |
US6440893B1 (en) | 2001-03-30 | 2002-08-27 | General Electric Company | Method and catalyst composition for producing aromatic carbonates |
US6441215B1 (en) | 2001-06-06 | 2002-08-27 | General Electric Company | Method for reducing carbonate decomposition in reaction mixtures |
US6734319B2 (en) | 2001-08-27 | 2004-05-11 | Bayer Aktiengesellschaft | Separation of impurities and/or valuable substances from solutions containing diaryl carbonate by solution crystallization |
US20040127736A1 (en) * | 2001-08-27 | 2004-07-01 | Claus-Peter Reisinger | Separation of impurities and/or valuable substances from solutions containing diaryl carbonate by solution crystallization |
US20030109738A1 (en) * | 2001-08-27 | 2003-06-12 | Claus-Peter Reisinger | Separation of impurities and/or valuable substances from solutions containing diaryl carbonate by solution crystallization |
US6914149B2 (en) | 2001-08-27 | 2005-07-05 | Bayer Aktiengesellschaft | Separation of impurities and/or valuable substances from solutions containing diaryl carbonate by solution crystallization |
US20030162652A1 (en) * | 2002-02-25 | 2003-08-28 | General Electric Crd | Method and catalyst composition for producing aromatic carbonates using activating solvents |
US6903049B2 (en) | 2002-02-25 | 2005-06-07 | General Electric Company | Method and catalyst composition for producing aromatic carbonates using activating solvents |
US20080053836A1 (en) * | 2006-09-02 | 2008-03-06 | Bayer Material Science Ag | Process for the production of diaryl carbonates and treatment of alkalichloride solutions resulting therefrom |
WO2015169775A1 (de) | 2014-05-09 | 2015-11-12 | Covestro Deutschland Ag | Verfahren zur herstellung von diarylcarbonaten |
CN109336764A (zh) * | 2018-11-28 | 2019-02-15 | 四川久润环保科技有限公司 | 一种乙醇、碳酸二苯酯、二丁酯混合物的分离方法及系统 |
CN113577814A (zh) * | 2021-08-16 | 2021-11-02 | 四川中蓝国塑新材料科技有限公司 | 一种用于聚碳酸酯工业化生产的碳酸二苯酯回收装置及方法 |
Also Published As
Publication number | Publication date |
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EP0583936A1 (de) | 1994-02-23 |
JP2752570B2 (ja) | 1998-05-18 |
DE69315011D1 (de) | 1997-12-11 |
EP0583936B1 (de) | 1997-11-05 |
ES2108826T3 (es) | 1998-01-01 |
DE69315011T2 (de) | 1998-06-10 |
JPH06172270A (ja) | 1994-06-21 |
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